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Abstract

We report solution processed highly photosensitive thin film transistors (TFTs) based on poly(9,9-dioctylfluorene-cobithiophene)
(F8T2) as an active photoconducting material. Bottom gate contact coplanar device structure on Si wafer
transistors was used. The photosensitivity of the drain photocurrent was investigated for different F8T2 annealing
temperatures and illumination irradiances. Transistors annealed at 280oC show the highest drain current, approximately 8
times higher than the as-spincoated device at room temperature with a gate voltage of -40V. However, the field effect
mobilities in the saturation regime for all devices at different annealing temperatures are in the same order of ~10-4
cm2/Vs. The field effect mobilities of the transistors were not affected by illumination, but the drain photocurrent of the
transistor was significantly increased and the threshold voltage was shifted towards zero bias voltage when the polymer
absorbs photons. The measured maximum responsivity was ~18.5 A/W for an LED light source with a peak wavelength
of 465 nm and 19 nm bandwidth at 5 μW/cm2 light intensity. This is so far the highest reported for F8T2
phototransistors. The characteristics of transistors dominated by the photoconductive effect (turn-off) as well as the
photovoltaic effect (turn-on) against a wide range of illumination intensities are reported.

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Journal of Applied Remote SensingJournal of Astronomical Telescopes Instruments and SystemsJournal of Biomedical OpticsJournal of Electronic ImagingJournal of Medical ImagingJournal of Micro/Nanolithography, MEMS, and MOEMSJournal of NanophotonicsJournal of Photonics for EnergyNeurophotonicsOptical EngineeringSPIE Reviews